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WO1995005709A1 - Emetteur-recepteur ir/rf ameliore - Google Patents

Emetteur-recepteur ir/rf ameliore Download PDF

Info

Publication number
WO1995005709A1
WO1995005709A1 PCT/US1994/009180 US9409180W WO9505709A1 WO 1995005709 A1 WO1995005709 A1 WO 1995005709A1 US 9409180 W US9409180 W US 9409180W WO 9505709 A1 WO9505709 A1 WO 9505709A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
frequency
receiver
infra
red
Prior art date
Application number
PCT/US1994/009180
Other languages
English (en)
Inventor
Robert J. Zavrel
Original Assignee
Gec Plessey Semiconductors, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gec Plessey Semiconductors, Inc. filed Critical Gec Plessey Semiconductors, Inc.
Publication of WO1995005709A1 publication Critical patent/WO1995005709A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1143—Bidirectional transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field

Definitions

  • the invention relates to radio electronics, particularly to improved radio transceivers combining infra ⁇ red (IR) and radio-frequency (RF) communication and signal detection techniques .
  • the invention resides in coupling an infra-red (IR) communication subsystem to a radio-frequency (RF) transceiver.
  • the IR subsystem includes an IR transmitter and receiver which may be coupled selectably by a switch to a data signal channel or source in the transceiver.
  • the IR receiver includes an inductor and a diode coupled in parallel, such that the IR receiver detects an IR signal, in significant part, by resonating such signal substantially at a detection frequency.
  • FIG. 1 is a generalized block diagram of an improved radio-frequency (RF) communication system having infra-red (IR) transmitter 24 and receiver 26.
  • RF radio-frequency
  • FIG. 2 is a block diagram of a prior-art digital radio transceiver, namely transceiver model DE6003 available from GEC Plessey Semiconductors.
  • FIG. 3 is a block diagram of the digital radio transceiver shown in FIG. 2, but modified for IR/RF signal communication according to the present invention.
  • FIG. 4 is a block diagram of alternate IR detector 103.
  • FIG. 5 is a simplified frequency response chart of sensed signal 70 according to the present invention.
  • FIG. 6 is a simplified frequency response chart of output signal 80 according to the present invention.
  • FIG. 1 shows a generalized block diagram of an improved radio-frequency (RF) communication system 10 having infra-red (IR) transmitter 24 and receiver 26 coupled thereto.
  • System 10 may be a conventional digital radio transceiver, such as the DE6003 Digital Radio Transceiver available commercially from GEC Plessey Semiconductors located in Scotts Valley, California.
  • FIG. 2 is a generalized block diagram of the prior-art DE6003 transceiver, showing conventional components, as configured presently, prior to modification according to the present invention.
  • system 10 contains transceiver circuitry 12, 14 for digital signal communication over allocated RF bands.
  • Data controller 16 serves as a data signal source or receptor for sending or receiving signals to RF transmitter 12 or from RF receiver 14 respectively, in accordance with normal radio operation of system 10.
  • IR transceiver 24 and receiver 26 may be coupled user-selectably by switches 20, 22 or connecting circuit 18 to data controller 16 for signal communication therebetween.
  • switch 22 may couple data controller 16 to IR receiver 26, instead of RF receiver 14, to enable data signal reception over IR spectrum, instead of RF spectrum (or vice versa) .
  • switch 20 may couple data controller 16 to IR transmitter 24, instead of RF transmitter 12, to enable data signal reception over IR spectrum, instead of RF spectrum (or vice versa) .
  • the DE6003 transceiver is modified functionally for coupling to IR transmitter 121, including photo-emitting diode 120 and buffer 122, or IR receiver or photo-sensitive diode 102, thereby providing combined RF and IR signal communication.
  • DE6003 is re ⁇ configured to include IR receiver 102 and IR transmitter 121, which may be coupled to DE6003 transceiver through switch 134 and switch 124 respectively.
  • switch 134 is switched to transmit mode (TX) , but may be switched to receive mode (RX) to couple IR receiver 102 to the DE6003 transceiver.
  • TX transmit mode
  • RX receive mode
  • IR receiver 102 functions to receive IR signals for the DE6003 transceiver.
  • IR transmitter 121 functions to transmit IR signals for the DE6003 transceiver.
  • the conventional components of the DE6003 transceiver may be re-configured to include switches 130, 124, as shown in FIG. 3.
  • switches 124, 130 may each be switched from RF transmit or receive mode, as shown, to IR transmit or receive mode. In this way, for example, during IR transmit or receive mode, switches 124, 130 are switched from the shown configuration to couple conventional components of the DE6003, thereby enabling RF transmit or receive mode.
  • IR detector 102 includes inductor circuit 114 and infra-red radiation detecting photo-diode 110, of a square-law type infra-red detector, and coupled thereto in parallel.
  • IR receiver 102 may detect an incoming, modulated IR signal, in significant part, by resonating such signal substantially at an RF baseband or carrier frequency or signal.
  • IR detector 102 couples the resonant structure 110, 114 to power 112 and ground 116, and provides detection signal 118 through capacitor 108 and buffer 106.
  • the received infra-red signal which is modulated at the RF baseband, is amplitude-shift keyed (ASK) , and frequency- shift keyed (FSK) by specified data.
  • ASK amplitude-shift keyed
  • FSK frequency- shift keyed
  • the frequency of the RF baseband is amplified by the resonating effect of inductive circuit 114 coupled to detecting diode 110 and its inherent capacitance, and detector 102 is thereby more sensitive to data frequency-shift keyed
  • IR receiver or detector 103 including inductor 114, IR signal photo-sensitive diode 110, capacitor 141, variable resistor 142, and transistor 140, coupled to power 112 and ground 116, to provide IR detection or sensed signal 118.
  • IR receiver 103 also functions generally as a so-called Colpitts oscillator.
  • IR detector 103 provides components 140, 141, 142 to inhibit conduction of direct current, and inhibit loading of the resonating effect. Additionally, such components 140, 141, 142 provide for increased amplification in output signal 118, beyond that which may be provided by the resonating effect of infra-red radiation-detecting diode 110 and inductor 114.
  • the incoming, received infra-red signal contains a carrier signal that is amplitude-shift keyed (ASK) and that is frequency-shift keyed (FSK) by modulating data information.
  • ASK amplitude-shift keyed
  • FSK frequency-shift keyed
  • the resonating effect occurs at the frequency of the carrier signal, such that output signal 118 is amplified substantially at this frequency.
  • a remote transmitter when operating, emits an infra-red signal that is amplitude-shift keyed (ASK) and that is frequency-shift keyed (FSK) by data information.
  • the infra-red radiation-detecting diode 114 of the invention senses this incoming signal, possibly including present infra-red "noise. " Because of such noise, it may be be difficult conventionally to distinguish the carrier signal from the noise.
  • the resonating effect at the frequency of the carrier signal facilitates IR signal detection, particularly by increasing effectively the detected amplitude of the carrier signal relative to the amplitude of the background noise.
  • the frequency of the carrier signal within the infrared spectrum is "atypical" (i.e., a frequency at which levels of noise that are sufficiently high to prevent conventional IR signal detection are not usually present . )
  • the atypical frequency may correspond to frequencies used in RF-based wide and local area networks, such that switching between RF and IR is easily accomplished.
  • the preferred RF baseband frequency is 38 MHz.
  • the data information which is frequency- shift keyed (FSK) about the carrier signal includes frequencies w ⁇ _ and W2 which may be provided in binary form, such that such frequencies correspond to logical high or low (1/0) signals.
  • a remote transmitter when operating, emits an infra-red signal at 38 MHz, which is amplitude-shift keyed (ASK) and that is frequency-shift keyed (FSK) by data information including a series of frequencies W]_ and W2 •
  • Infra-red radiation-detecting diode 110 senses the incoming signal, along with infra-red noise.
  • the resonating effect of inductor 114 together with the effective capacitance of diode 110 resonates the incoming, sensed signal at 38 MHz, which is the frequency of the carrier signal.
  • the amplified sensed signal may then be further amplified and buffered.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

On modifie un émetteur-récepteur radiofréquence (RF) numérique en couplant ce dernier à un sous-système de transmission infrarouge (IR). Le sous-système comprend un émetteur et un récepteur IR qui peuvent être couplés de manière sélective à un canal ou une source de signal de données dans l'émetteur-récepteur. Le récepteur IR comprend de préférence une bobine d'inductance et une diode couplées en parallèle de sorte que le récepteur IR détecte un signal IR principalement en faisant résonner ce signal sensiblement à une fréquence de détection ou de bande de base RF.
PCT/US1994/009180 1993-08-13 1994-08-11 Emetteur-recepteur ir/rf ameliore WO1995005709A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/106,278 1993-08-13
US08/106,278 US5585953A (en) 1993-08-13 1993-08-13 IR/RF radio transceiver and method

Publications (1)

Publication Number Publication Date
WO1995005709A1 true WO1995005709A1 (fr) 1995-02-23

Family

ID=22310543

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/009180 WO1995005709A1 (fr) 1993-08-13 1994-08-11 Emetteur-recepteur ir/rf ameliore

Country Status (2)

Country Link
US (1) US5585953A (fr)
WO (1) WO1995005709A1 (fr)

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CN1076909C (zh) * 1995-06-14 2001-12-26 日本电气株式会社 能减少通信过程中数据通信装置处理量的红外空间通信系统
EP1933288A2 (fr) 2006-12-15 2008-06-18 SMK Corporation Module de communication par RF et système de communication par RF
EP2256926A1 (fr) * 2009-05-29 2010-12-01 LG Electronics Inc. Dispositif de pointage multimodal et procédé de fonctionnement d'un dispositif de pointage multimodal
US8126030B2 (en) 2005-08-31 2012-02-28 Motorola Mobility, Inc. Multi-mode wireless communication device and method
US8704958B2 (en) 2009-06-01 2014-04-22 Lg Electronics Inc. Image display device and operation method thereof

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Cited By (15)

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CN1076909C (zh) * 1995-06-14 2001-12-26 日本电气株式会社 能减少通信过程中数据通信装置处理量的红外空间通信系统
US8005364B2 (en) 1999-11-16 2011-08-23 Motorola Mobility, Inc. Method and apparatus for communicating in the presence of radio frequency energy
GB2360655B (en) * 1999-11-16 2003-07-23 Motorola Inc Wireless communication device and method having coordinated primary and secondary transmitters
US6782208B1 (en) 1999-11-16 2004-08-24 Motorola, Inc. Wireless communication device and method having coordinated primary and secondary transmitters
GB2360655A (en) * 1999-11-16 2001-09-26 Motorola Inc Wireless communication device having co-ordinated primary and secondary transmitters
US8126030B2 (en) 2005-08-31 2012-02-28 Motorola Mobility, Inc. Multi-mode wireless communication device and method
US8068013B2 (en) 2006-12-15 2011-11-29 Smk Corporation RF communication module and RF communication system
EP1933288A3 (fr) * 2006-12-15 2009-09-02 SMK Corporation Module de communication par RF et système de communication par RF
EP1933288A2 (fr) 2006-12-15 2008-06-18 SMK Corporation Module de communication par RF et système de communication par RF
CN101901537A (zh) * 2009-05-29 2010-12-01 Lg电子株式会社 多模指点装置以及操作多模指点装置的方法
EP2256926A1 (fr) * 2009-05-29 2010-12-01 LG Electronics Inc. Dispositif de pointage multimodal et procédé de fonctionnement d'un dispositif de pointage multimodal
EP2453575A3 (fr) * 2009-05-29 2012-08-15 LG Electronics Inc. Dispositif de pointage multimodal et procédé de fonctionnement d'un dispositif de pointage multimodal
CN101901537B (zh) * 2009-05-29 2013-01-30 Lg电子株式会社 多模指点装置以及操作多模指点装置的方法
US9467119B2 (en) 2009-05-29 2016-10-11 Lg Electronics Inc. Multi-mode pointing device and method for operating a multi-mode pointing device
US8704958B2 (en) 2009-06-01 2014-04-22 Lg Electronics Inc. Image display device and operation method thereof

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